package com.szl.yeb.controller;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * @program: yeb
 * @description: 验证码接口
 * @author: szl
 * @create: 2022-08-24 21:05
 **/
@Api(tags = "验证码接口(CaptchaController)")
@RestController
public class CaptchaController {
    @Autowired
    private DefaultKaptcha defaultKaptcha;

    @GetMapping(value = "/captcha",produces = "image/jpeg")
    @ApiOperation("获取验证码")
    public void captcha(HttpServletRequest request, HttpServletResponse response){

        // 定义response输出类型为image/jpeg类型
        response.setDateHeader("Expires", 0);
        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        // Set standard HTTP/1.0 no-cache header.
        response.setHeader("Pragma", "no-cache");
        // return a jpeg
        response.setContentType("image/jpeg");

        //获取验证码文本内容
        String text = defaultKaptcha.createText();
        System.out.println("验证码内容："+text);
        //将验证码文本内容放入session
        request.getSession().setAttribute("captcha",text);

        //根据文本验证码内容创建图形验证码
        BufferedImage image = defaultKaptcha.createImage(text);

        try (ServletOutputStream outputStream = response.getOutputStream()){
            ImageIO.write(image,"jpg",outputStream);
            outputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
